package com.example.demo;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
@Bean
    public CommandLineRunner commandLineRunner (ApplicationContext ctx) {
    return args -> {
        System.out.println("由Spring Boot注册的所有的Bean:");
        String[] beanNames = ctx.getBeanDefinitionNames();
        Arrays.sort(beanNames);
        for (String beanName : beanNames) {
            System.out.println(beanName);
        }
    };
}
 @RestController
 static class HelloWorldControcoller{
        @RequestMapping("hello")

     String index(){
         return "你好，spring boot";
     }
 };
}
